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    //! Priority mask register

    /// All exceptions with configurable priority are ...
    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
    pub enum Primask {
        /// Active
        Active,
        /// Inactive
        Inactive,
    }

    impl Primask {
        /// All exceptions with configurable priority are active
        pub fn is_active(&self) -> bool {
            *self == Primask::Active
        }

        /// All exceptions with configurable priority are inactive
        pub fn is_inactive(&self) -> bool {
            *self == Primask::Inactive
        }
    }

    /// Reads the CPU register
    #[inline]
    pub fn read() -> Primask {
        match () {
            #[cfg(cortex_m)]
            () => {
                let r = match () {
                    #[cfg(feature = "inline-asm")]
                    () => {
                        let r: u32;
                        unsafe { asm!("mrs $0, PRIMASK" : "=r"(r) ::: "volatile") }
                        r
                    }

                    #[cfg(not(feature = "inline-asm"))]
                    () => {
                        extern "C" {
                            fn __primask() -> u32;
                        }

                        unsafe { __primask() }
                    }
                };

                if r & (1 << 0) == (1 << 0) {
                    Primask::Inactive
                } else {
                    Primask::Active
                }
            }

            #[cfg(not(cortex_m))]
            () => unimplemented!(),
        }
    }

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